Caller ID on land line phone not working and can't text

Few weeks ago I lost caller ID on land line home phone. Can't get it on pc app either. Now I can't text via the Comcast app. Nobody at Comcast can identify problem. This happened before with an upgrade few months back and now it's happened again. When it happened last October one of the tech people figured it out and fixed problem. You'd think the CS folks would look back on my records from October to find out what they did so they can fix it now, but no. Think I will go back to regular texting from Verizon. Was told uninstalling and reinstalling the Xfinity app won't help. Thanks, C